Update the electron target to 0.30.3.
Update the electron target to 0.30.3.

On my system this changes the default downloads directory from a hidden
directory in Application Support to ~/Documents.

refs #57


Former-commit-id: 4386cba1d25da47bd09a8b38f61d70f1aea26b01
nprapps/lunchbox,nprapps/lunchbox,nprapps/lunchbox